I have been working on my tower. I have definately decided on the concept I want to follow. But... I now have several versions. So I would like some opinions on which one works best.

Number 1 and 2 are quite similar, but with different broken glass. Number 3 is a slightly different idea I started playing with, where you see earth through a hole in the glass (4 is the same, but then with a lightning bold added). Now I am not sure which works best...

There is still the logo of depositosphotos in all the pictures (and a arrow sometimes), because I first wanted to be sure which one I am gonna use before I buy the damn picture (of the broken glass, tried it myself, didn't work). So these are experiments on low-res. The final version will not have the logo.